Question

what does the bold appositive phrase refer to? booker baxter - carters lucky charm, a stuffed giraffe, goes everywhere with him.

Explanation:

An appositive phrase provides additional information or renames a noun. In the sentence, "a stuffed giraffe" is the appositive phrase, and it renames "Booker Baxter - Carter's lucky charm", so it refers to Booker Baxter - Carter's lucky charm.

Answer:

Booker Baxter - Carter's lucky charm